Fix RESP3 client handshakes on non-RESP3 servers#3037
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- `HELLO 3` with `3` response: pass - `HELLO 3` with `-ERR` response: fail - `HELLO 3` with `2` response: fail
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RESP2 on RESP2 servers, and RESP3 on RESP3 servers have both always been fine; however, requesting RESP3 on servers that either don't support RESP3 at all (
-ERR) or (like DMC in the past) reject RESP3: have had bumps. We fix this here by:fix #2783